DJMax Technika Q Song Format

Original from: https://github.com/oliverchang/technika_q/blob/master/format.md

The track format has changed from that, this is the latest format

Header

4 bytes unknown (always zeros?)
4 bytes offset to song information

Song information (usually at the very end of the file)

2 bytes number of sounds
2 bytes number of tracks?
2 bytes number of positions per measure?
4 bytes initial BPM (float) (can be 0 if contains change bpm cmd)
4 bytes end position
4 bytes unknown (another float?) (Tag B)
4 bytes end position
4 bytes total command count?(can be 0) (not include start of track, but include change bpm )

Sounds Table

Starts at offset 8
An array of entries that are 0x43 bytes in size each:
- 2 bytes index
- 1 byte unknown
- 0x40 bytes filename

Tracks

Track header:
- 2 bytes of 0x0
- 0x3B bytes of track name (The track name doesn't relate to it's function. Actually all the track name is empty string in the later patterns)

Follow by

An array of commands (0xD bytes each):
- 4 bytes position
- 1 byte command type
- 8 bytes of params

Notes

The position refers to a position in the song
- Its meaning is determined by the number of positions per measure (in song info)
- Assumes 4/4 time signature?
There are usually 64 tracks
The playable tracks for 3 lines are (0 indexed in order of appearance in file):
- 0: top line
- 1: middle line
- 2: bottom line

Command types

0: Start of a track

Params

4 bytes note count shifted?
4 bytes note count

1: Note

Params

2 bytes Sound index in sounds table
1 byte Volume
1 byte Pan
1 byte Attribute (Note type)
1 byte? length (for long notes, unit is a single position)
2 bytes unknown

Attributes

0: normal note (drag note if length != 0x6)
A: repeat note
B: last repeat note
C: hold note
5: chain note start (all notes in between have type 0)
6: chain note end
2: unknown
100: VideoStart
150: ?

2: Volume

Params

1 bytes volume
7 bytes unknown (It is ok to fill with 0)

3: BPM change

Params

4 bytes float BPM
4 bytes unknown

4: Unknown